<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button id="btn">点我调用fn</button>
    <script>
        const str = "我爱javascript"
        console.log(str.includes("aaa"));



        // function fn(a,obj,fnn){
        //     console.log(a,obj,fnn());
        // }

        // btn.onclick = function(){
        //     fn(1,{name:"张三"},fn1);
        // }

        // function fn1(){
        //     console.log("这是一个fn1的函数");
        // }
    </script>
</body>
</html>